Several times I have received an error message when trying to send mail, sometimes when replying, sometimes when sending to a group.
The message appears in the status bar (at the bottom) and says: "Error occurred, check the error log."
What/Where is the error log?

I find the message in the Draft folder.

I have had this message if I tried to send when not connected, and found the message in the Draft folder, but this is happening when I am connected. (dial in)